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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
- Sprache
- Englisch
- Signatur
- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
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- SLUB Dresden
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- http://digital.slub-dresden.de/id1780948042-18620000
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- Seite 1-72 fehlen in der Vorlage. Vorlagebedingter Textverlust.
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- Parlamentsperiode
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- Wahlperiode
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- Bandzählung
- No. 200, Juny 4, 1862
- Digitalisat
- SLUB Dresden
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- Ausgabe
- Parlamentsperiode
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- Wahlperiode
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Zeitschrift
The photographic news
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Band 6.1862
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- Ausgabe Ausgabe 73
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- Register Index 619
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Band
Band 6.1862
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July 4,1862.] THE PHOTOGRAPHIC NEWS. 315 4,1862. suggeslI JBt kipd, UyeC esults, " bo accol , ieswit)) there C owed “ail nadevir iersinis the lar pbol negatile mnsesg" n now J Mail.’,’ j tai' 6, j Ule Jnternational Gxhibition. PHOTOGRAPHIC CHEMICALS. TiE largo manufacturing chemists, as might he expected, make an excellent show in the Eastern Annexe, and nothing shows the importance of photography more than the pro minence given to chemicals which are used exclusively, or nearly so, hy the cultivators of this art. Some very fine samples of pyrogallic and gallic acids are exhibited by Messrs. May and Baker, who also show some large slabs of commercial cyanide of potassium, upwards of eighteen inches across and three thick. This, however, does not look very pure, but the same firm has a smaller sample of cyanide which is beautifully white; their speciality seems to be mercury and bismuth compounds, some magnificent crystals of calomel and corrosive sublimate being in the case. The former is, however, becoming very discoloured, probably by the light; this seems to point to some photographic qualities of this salt which are not generally known. A beautiful series of acetates and some samples of acetic acid, are shown by the well known house of C. Foot and Co. They have also a large quantity of dried albumen, still retaining its solubility in water. The substance labelled “egg albumen,” seems, from its colour and general appearance, as if it would prove of considerable value to photographers when eggs are scarce, but the article styled “ blood albumen ” is not sufficiently tempting, either from its appearance or origin, to justify us in recommending its employment for photographic purposes, although, from its low price, we have no doubt that it frequently enters into the composition of the extra-cheap albumenized paper. We also noticed in this case a bottle of formic acid, a body which has on several occasions been recommended for use in photography', and which, from its energetic reducing properties, cannot fail to be of considerable use when it is better known. Messrs. Foot and Co., we understand, are now enabled to supply this acid at a comparatively low price, and we would, therefore, at once suggest its employment in both positive and negative developing solutions, in which it might partially, if not en tirely, replace acetic acid. Acetic acid is also shown by the large makers, Cox and Gould, who exhibit an interesting series, explaining the different stages of its manufacture, from the rough log of wood, and the crude pyroligneous acid, which is a product of its destructive distillation, up to the purified glacial acetic acid. Two remarkable looking objects in the same case would puzzle any photographic chemist to identify them ; one is a lump of fused iodide of potassium, and the other a corresponding lump of fused bromide of potassium. The only substance to which we can compare them, is a piece of excessively fat meat, with streaks of lean showing themselves here and there. These are, of course, only shown to illustrate one stage in the manufacture of these salts, the crystallized compounds being also exhibited in a very pure state. Messrs. Davy, Mackmurdo, and Co. show several prepa rations of photographic interest. One in particular we may specify. A large bottle of dry and apparently pure chlo ride of gold in fine crystals. Near it is a corresponding bottle of chloride of platinum almost equally good. Their iodide of sodium, bromide of ammonium, and iodide and bromide of cadmium, may also be specially commended for their purity and definite crystalline appearance; the iodide of cadmium crystals are especially large. Amongst the other chemical compounds of scientific interest which this firm exhibits, we may mention valerianic acid, and some valerianates, not, r the p iful post"’) ding 901 cal quality ow it oir fistic rf spectiveal upon a the det/ Thus® line by. parts lef % n a view * a buildit straigll ers. < d prop, dfromt qa"e d not bo” panora!, ford fittiz e, and" describ I a tasted cttowl ityof6" hing2) condil cessat), ilar to | irougbs re. P ery PP" n in er ned t® 1 This < f view’ dnotf I would], er than ‘ li cotP tionfortt lastic test lay a vtit contact os’ ir. Ashed losely inter ravenf®' ■ight ang ime allsc” ferentvar it against 5 ly in cont Fine wl! suitable i rt says t bition soo AN EXPERIMENT UPON MOSER'S IMAGES. BY M. D. VAN MONCKHOVEN. PaorogRapmIO images are, as it is well known, formed of pure silver, disseminated in a transparent film of pyroxylinc, albumen, or other porous substances. We are reminded also of the celebrated discovery of the sculptor Rauch, who, having left an engraving in contact with a plate of glass, saw the image of his engraving reproduced upon it after the lapse of a certain time. Many years since we observed an analagous fact. A glass which covered a photographic picture presented, after clean- ing, the same image on its surface, when the breath was condensed upon it. And, moreover, the image was not easily effaced. We have recently observed the same fact again. The glass which sustained the film is green : it is a glass having soda for a base, with a small quantity of lead. It had upon it a collodion portrait, taken in 1857, and since that date has fen kept in a very dry and dimly-lighted room, with some fifty other glass plates. Some weeks ago all these glasses were cleaned. Chance led me to discover that one, when breathed upon, displayed A very intense image. It might be called a Daguerreotype portrait. Viewed by reflected light, the image is a negative. • corresponds, therefore, exactly to that of the collodion "Im. Among all the glass plates this was the only one that exhibited this phenomenon. From information obtained from very reliable sources, this fact, I find, occurs frequently to professional photographers, who preserve their negatives. With respect to the theory of the Daguerreotype, it will be very useful to have their attention directed to this fact, in view of the curious ex periments to which it gives rise. The glass plate described was now coated with iodized collodion, sensitized in a bath of nitrate of silver, and placed in an ordinary camera pointed to the model. The negative obtainedawas double, the new image and a second, Wry weak; beneath it resembled the invisible image, im printed upon the glass plate. The experiment, repeated several days subsesequently, in the fear that we had to do with one of the phenomena of "stored-up light,” described by M. Niepce de Saint Victor, still gave two images : that newly obtained, and a second, Yury weak one, beneath it, but still quite visible. We were much occupied with this fact, when the idea Ocsured to us of operating in the dark, without exposing the piate in the camera. This time, after fixing, we could discover only a scarcely perceptible image. It is well known Vat the polarization of light, resulting from reflection from 2 surface of metals, does not possess the same properties as from non-metallic reflecting surfaces. We took ad- Bntage of this property to render the preceding image lsible. To this end, it sufficed to examine with a Nicol’s Prism the film containing the image under the angle of '"cidence necessary to polarize the light, and to turn the Prism so as to extinguish the light reflected by the glass. Me succeeded better by blackening the back of the glass, die silver, constituting the image, did not participate in the properties of ordinary polarized light, the image, which 1128 been visible only because we suspected its existence, became fully visible even to persons who previously could 866 nothing. This means of recognizing the silver, may Prove very useful on account of its extreme sensibility, to Ascertain, for instance, if the light in ordinary photographic Pnocesses, really decomposes the iodide of silver, or if it onl communicates to it new physical properties. oMow.what can Pio the mysterious cause of the impression an image upon the surface of a glass plate and which sisrwards gives to it the properties of reducing iodide of ver. There cannot be a doubt that this is not a pheno- Covon of the “ stoning up of light ” for very glass plate exyredfor a certain time with a photographic image and ■1 sed to light, should present analogous properties. If it is a molecular modification of the surface of the glass, under what conditions does it act? from whence comes its property of acting upon iodide of silver? It is certainly only by collecting a great number of facts and discussing them, that we can arrive at a sound hypothesis upon this series of phenomena.
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